To prevent typhoons from reaching your city (Hong Kong), damaging its stock market.
This is the health of the stock market (stock price).
It will rise steadily as long as people go to work.
You build new structures at a cost of the stock price
When a typhoon becomes too close to Hong Kong, the stock price goes down sharply too.
When HSI becomes zero, the game is over as the economy of Hong Kong is at stake.
you have
3 types of offensive towers,
2 types of power plants, and
3 types of research structures.
Offensive towers must be built on sea, the others on land.
All structures rely on power. you can see the power requirements by pointing your mouse cursor over the build button (when you can build it)
Towers need power to attack.
Powerplants generate power quota, towers consume power.
The available power is shown in the top right corner
If power quota is not enough for the towers, there is a power outage and ALL towers will not shoot.
Inside the game, you can see how much power each structure needs by pointing your cursor at the button.
You start with the basic LaserTower. As you build more research structures, new towers are unlocked and existing towers get upgraded.
Shoots laser at typhoon, disrupting local temperature and reduce typhoon strength.
Shoots cold air at typhoon, reducing it movement speed
Exerts a repel force at 1 typhoon around it. It may push the entire typhoon away (or the other way?) depends on how you place it.
You start with the basic PowerPlant, and you can unlock the nuclear powerplant later.
Generates power that can hold a few LaserTower.
Generates more power than the normal one, but it is also much more expensive because it takes less space.
These tech buildings have quite a cost, but having them will unlock all sorts of power for your defense system.
Note: You only need 1 of each tech structure to have their powers. Effects don't stack.
It unlocks the freeze tower, and it upgrades LaserTowers in range and flat damage, and increases cost
Unlocks The RepelTower,
further increases LaserTower range, damage and cost,
as well as FreezeTower slowrate, range, damage and cost
Upgrades Repel tower, increasing range, force, cost. Also doubles HSI increase Rate.